Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00bdf2d30f7070c…

MALICIOUS

PDF

95.7 KB Created: 2021-07-05 12:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34491281a59b09bbff20bd5157abb76f SHA-1: 37b0a46cd519df775b55923c3778a5fce7338127 SHA-256: c00bdf2d30f7070cbe2169445e5f3733fa8636e9d5c49a8d4e8805379144f296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=how+to+use+magic+ns+on+pc PDF link annotation
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/399495c894c1335c309eed5bc0bee1c7/35161987123.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a7eddc2a6cd282f487744cd02d19cd5a/govixalala.pdfIn PDF document text
    • http://teifsepahan.com/files/file/23615609786.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/37cf0a3060f4b6183b1125c1e1bc9a35/82925261087.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3d4ead5e---zefolojabokuputovoxop.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/32653225387.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5ccfe1dc454168b6164aef05bd5a27e5/kotadibiwovimexod.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078b93baddf3---sisagonevis.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/59899132573.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/330459efbf4ead1fd04149aea19d61fb/vewaw.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087466ceb7d2---66235417826.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160783a7fb80e8---ralupusugubupijirozulave.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/77910984875.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f9f2ff29487e981e464c6c43e355d011/25203159661.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/rebifarepifazata.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd356a0c7---tewuzamageba.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ab9062eea298975368c131da368cb71d/34144512472.pdfIn PDF document text
    • http://aweibel.com/Photo/file/gogitezewewomafetuwepup.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/639f1e0c3f3b4525f9836ba6b9694cf7/95832934156.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4d304543ab5b9e4777742b51d411f308/4933511270.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/velamarifelak.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5b4d221---tagabubarob.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f48661b1---lunewe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 10748 bytes
SHA-256: 2de6eea4d72189ff7b2d379c752ef2e5f7eceb7304309d3f939900cc7f00a5c4
font_01_sfnt_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C3 17060 bytes
SHA-256: fb01fbe246123a08838ebf1b9f75d4413da778168a5cbe62ebc2136a3db3873b

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